I am trying to develop a pacing chart for runners in php. For this i require the difference in the altitude for each kilometer.

I have used a website www.logyourun.com to trace a route of the Comrades Marathon, an 89km race from Durban to Pietermaritzburg in KwaZulu Natal, South Africa. It is the most important race in the South African running calendar.

From the site I can download 2 files as GPX (Google Earth and others) or TCX (Garmin training center)